I was wondering if you can check fertility on eggs that don't develop after 7 days. I took some eggs that didn't develop and cracked them open, some started and had a little "meat" and few blood vessels, but only one or two veins. Others had nothing and did not appear fertile. Would eggs that had been in the incubator still show that they were fertile? I'm curious as these where eggs I bought and had shipped. This particular batch wasn't an expensive batch, but I thought it was be nice to know this for future batches for more expensive eggs. Thanks!